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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Physical Explanation of Tropospheric Aerosol Effects on Twilight Sky Color Based on Photographic Observations and Radiative Transfer Simulations
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Physical Explanation of Tropospheric Aerosol Effects on Twilight Sky Color Based on Photographic Observations and Radiative Transfer Simulations

机译：基于摄影观测和辐射传递模拟的对流层气溶胶对暮色天空色彩的物理解释

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References(23) Supplementary materials(1) The relationship between the twilight sky and atmospheric state has been studied for the past 50 years, providing a good understanding of the general picture of the radiative transfer process under twilight conditions. However, tropospheric aerosols may strongly affect the spectral characteristics of the twilight glow near the horizon under clear-sky conditions, and the mechanism of this phenomenon is not well understood because of its high complexity. In this study, we observed the twilight sky using a digital camera and calculated the spectral radiance of the twilight sky using a radiative transfer model (RTM). Photographic observations aided by several ground-based radiometric measurements revealed that tropospheric aerosols significantly influenced the twilight sky color. In particular, the sky near the horizon became darker and bluer with increasing aerosol optical depth (AOD), which was consistent with the RTM simulations. The RTM simulations also showed for the first time that bluish multiply scattered light dominated the twilight sky near the horizon and reddish singly scattered light decreased with increasing tropospheric AOD. These simulation results suggest that photographic observations have the potential to characterize tropospheric aerosols under twilight conditions.
机译：参考文献（23）补充材料（1）在过去的50年中研究了暮光天空与大气状态之间的关系，使您对暮光条件下辐射传输过程的总体情况有了很好的了解。但是，对流层气溶胶可能会在晴空条件下强烈影响地平线附近暮光的光谱特征，并且由于其高度复杂性，人们对该现象的机理还不甚了解。在这项研究中，我们使用数码相机观察了暮色天空，并使用辐射传递模型（RTM）计算了暮色天空的光谱辐射率。借助几项基于地面的辐射测量的摄影观测结果表明，对流层气溶胶显着影响了暮色的天空颜色。特别是，随着气溶胶光学深度（AOD）的增加，地平线附近的天空变得更暗和更蓝，这与RTM模拟是一致的。 RTM模拟还首次显示，蓝色的多重散射光主导了地平线附近的暮光天空，红色的单个散射光随着对流层AOD的增加而减少。这些模拟结果表明，摄影观察具有在黄昏条件下表征对流层气溶胶的潜力。

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